Generalized Non-Homogeneous Morrey Spaces And Olsen Inequality

In this paper, we shall discuss some properties of generalized non-homogeneous Morrey spaces. In addition, we will also prove the Olsen inequality in the non-homogeneous setting. Our proof utilizes the result of (García-Cuerva and Martell, 2001) on the boundedness of the fractional integral operator on Lebesgue spaces of non-homogeneous type

Analysis of the String Structure Near Break-up of A Slender Jet of An Upper Convected Maxwell Liquid

In this paper, we analytically study the string structure near the break-up of a slender jet of a viscoelastic liquid surrounded by air. The governing equations are derived from the conservation laws of mass and momentum, and the rheological equation of the jet. The rheological equation of the jet is assumed to satisfy an Upper Convected Maxwell (UCM) model. Introducing a stretch variable and then applying a transformation, we obtain a coupled system of nonlinear differential equations. Via these equations, we then show that the UCM jet does not break up in finite time, which physically means that it has sufficient time to exhibit the string structure before it breaks up due to the dominant surface force

Studi Penyebaran Kempas (Koompassia Malaccensis Maing.) di Areal Iuphhk PT. Wanasokan Hasilindo Kalimantan Barat

Kempas (Koompassia malaccensis Maing) belongs to the family Leguminosae is a timber species of high economic value and is a honey bee nest, so if it is not preserved lead to decreased amounts of this type. This research was conducted to determine the spread Kempas area in IUPHHK PT. Wanasokan Hasilindo Ketapang West Kalimantan. The method used is the analysis of vegetation in a way checkered line with the size of sample plots for vegetation is 20mx20m tree level. The number of sampling plots were made 50 plots or ​​2 hectars are. Sample plots laid out in two (2) location of the observation that the observation area located 25 sample plots. In the first line that starts from the edge of the river, Kempas at the seedling types were dominant in the first type, the saplings and small trees Kempas was ranked eleventh while the tree is on the order of three. In the second pathway that is placed on a ridge, the type Kempas at the seedling was ranked two dominant types, the stake is on the order of eight, the pole is on the order of five, while the tree is on the order Kempas three dominant types. Keyword : Spread, Kempas (Koompassia malaccensis Maing), Dominance, IUPHHK PT.Wanasokan Hasilind

Dynamic Behavior of Reverse Flow Reactor for Lean Methane Combustion

The stability of reactor operation for catalytic oxidation of lean CH4 has been investigated through modeling and simulation, particularly the influence of switching time and heat extraction on reverse flow reactor (RFR) performance. A mathematical model of the RFR was developed, based on one-dimensional pseudo-homogeneous model for mass and heat balances, incorporating heat loss through the reactor wall. The configuration of the RFR consisted of inert-catalyst-inert, with or without heat extraction that makes it possible to store the energy released by the exothermic reaction of CH4 oxidation. The objective of this study was to investigate the dynamic behavior of the RFR for lean methane oxidation and to find the optimum condition by exploring a stability analysis of the simple reactor. The optimum criteria were defined in terms of CH4 conversion, CH4 slip, and heat accumulation in the RFR. At a switching time of 100 s, the CH4 conversion reached the maximum value, while the CH4 slip attained its minimum value. The RFR could operate autothermally with positive heat accumulation, i.e. 0.02 J/s. The stability of the RFR in terms of heat accumulation was achieved at a switching time of 100 s

Homogeneity of Continuum Model of an Unsteady State Fixed Bed Reactor for Lean CH4 Oxidation

In this study, the homogeneity of the continuum model of a fixed bed reactor operated in steady state and unsteady state systems for lean CH4 oxidation is investigated. The steady-state fixed bed reactor system was operated under once-through direction, while the unsteady-state fixed bed reactor system was operated under flow reversal. The governing equations consisting of mass and energy balances were solved using the FlexPDE software package, version 6. The model selection is indispensable for an effective calculation since the simulation of a reverse flow reactor is time-consuming. The homogeneous and heterogeneous models for steady state operation gave similar conversions and temperature profiles, with a deviation of 0.12 to 0.14%. For reverse flow operation, the deviations of the continuum models of thepseudo-homogeneous and heterogeneous models were in the range of 25-65%. It is suggested that pseudo-homogeneous models can be applied to steady state systems, whereas heterogeneous models have to be applied to unsteady state systems

Analysis of the String Structure Near Break-up of A Slender Jet of An Upper Convected Maxwell Liquid

In this paper, we analytically study the string structure near the break-up of a slender jet of a viscoelastic liquid surrounded by air. The governing equations are derived from the conservation laws of mass and momentum, and the rheological equation of the jet. The rheological equation of the jet is assumed to satisfy an Upper Convected Maxwell (UCM) model. Introducing a stretch variable and then applying a transformation, we obtain a coupled system of nonlinear differential equations. Via these equations, we then show that the UCM jet does not break up in finite time, which physically means that it has sufficient time to exhibit the string structure before it breaks up due to the dominant surface force

Distribusi Aliran Dalam Reactor Berkanal Mikro

Reactor mikro telah menempatkan diri pada posisi yang diminati dalam pengembangan teknologi reactor modern yang memiliki karakteristik pokok dalam hal  percepatan laju perpindahan massa dan panas yang berlipat ganda. Dengan dimensi yang berskala mikron, distribusi aliran dari pipa induk menuju masing-masing kanal merupaka salah satu persoalan penting untuk menjamin keseragaman aliran di setiap kanal. Makalah ini mengkaji distribusi aliran dalam lima model reactor dan shift converter yang mengkonversi CO menjadi CO2 agar tidak meracuni katalis dalam sel bahan bakar. Selanjutnya pada model reactor dengan distribusi terbaik, karakteristik cold start up ditelaah lebih mendalam melalui teknik reaksi kimia tak tunak. Hasil studi menunjukkan bahwa start up pada shift converter dapat dilakukan dalam waktu yang sangat singkat yang menunjukkan bahwa secara praktis unit reactor mikro ini dapat diterapkan. Kata kunci : reactor mikro, pemodelan dan simulasi, shift converter, miniaturisas

Determination of Kinetic Parameters for Methane Oxidation Over Pt/γ-Al2O3 in a Fixed-Bed Reactor

This paper describes akinetic study for the determination of the kinetic parameters of lean methane emission oxidation over Pt/γ-Al2O3 in a dedicated laboratory scale fixed bed reactor. A model ofthemechanistic reaction kinetic parameters has been developed. The reaction rate model was determined using therate-limiting step method, which was integrated and optimized to find the most suitable model and parameters. Based on this study, the Langmuir-Hinshelwood reaction rate model with the best correlationis the one where the rate-limiting step is thesurface reaction between methane and one adsorbed oxygen atom. The pre-exponential factor and activation energy were 9.19 x 105 and 92.04 kJ/mol, while the methane and oxygen adsorption entropy and enthalpy were –17.46 J/mol.K, –2739.36 J/mol,–16.34 J/mol.K, and –6157.09 J/mol, respectively